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We report deep imaging observations with DOLoRes@TNG of an ultra-faint dwarfsatellite candidate of the Triangulum galaxy (M33) found by visual inspectionof the public imaging data release of the DESI Legacy Imaging Surveys. PiscesVII/Triangulum (Tri) III is found at a projected distance of 72 kpc from M33,and using the tip of the red giant branch method we estimate a distance ofD=1.0 +0.3,-0.2 Mpc, meaning the galaxy could either be an isolated ultra-faintor the second known satellite of M33. We estimate an absolute magnitude ofM_V=-6.1+/-0.2 if Pisces VII/Tri II is at the distance of M33, or as bright asM_V=-6.8+/-0.2 if the galaxy is isolated. At the isolated distance, it has aphysical half-light radius of r_h=131+/-61 pc consistent with similarly faintgalaxies around the Milky Way. As the tip of the red giant branch is sparselypopulated, constraining a precision distance is not possible, but if PiscesVII/Tri III can be confirmed as a true satellite of M33 it is a significantfinding. With only one potential satellite detected around M33 previously(Andromeda XXII/Tri I), it lacks a significant satellite population in starkcontrast to the similarly massive Large Magellanic Cloud. The detection of moresatellites in the outskirts of M33 could help to better illuminate if thisdiscrepancy between expectation and observations is due to a poor understandingof the galaxy formation process, or if it is due to the low luminosity andsurface brightness of the M33 satellite population which has thus far fallenbelow the detection limits of previous surveys. If it is truly isolated, itwould be the faintest known field dwarf detected to date.

Pisces VII: Discovery of a possible satellite of Messier 33 in the DESI Legacy Imaging Surveys